[time-nuts] Strange effect with C-Field change
wa1raj at arrl.net
Thu Mar 24 21:20:38 EST 2005
Just wanted to mention that I've been making C-field adjustments on my
5061A for the
last few weeks while monitoring its performance vs. the Z3801A. I've
had quite a few
large ESD events after shuffling across the carpet and down the basement
the discharge went directly to the C-field knob / outer protective
shield. I've not seen
any phase jumps I could account for in this way.
The '61A is also really well shielded internally - I'd be really
surprised if there was any
interference to its internal circuitry with a low power device like a
cordless phone or cell
phone. Even with connections to stuff you would expect could cause
a connection from the control voltage output BNC to a 3456 meter for
found the '61A to be surprisingly stable even in RF fields (high power
from 160 M
through 2 M) encountered near my station.
YMMV, as they say.
After spending a bit of time tweaking it is quite amazing how well one
of these older
units will perform - with the typical caveats about fairly stable
and other environmental factors. Parts in 10E-13 seem readily attainable
- and I've
been impressed with the re-trace after powering the Cs tube down for a
and then restarting. Not too shabby for the price.
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